Most glass that has polished edges is polished from were its produced using automated machines, usually special order as its expensive varying on glass thickness. The way glass is polised is much like wood using course to super fine grids but with alot more difficulty.
On a already assembled tank this will only increase the level of difficulty as none of the peices can be removed and taken to a water fed belt sander, which is required not only to cut down on dust but reduce heat that can cause cracks, and flares or shells which could later crack after the tank is filled.
Short and sweet, unless you work with glass I would not recomeend attempting to polish the edges of your tank as you are more likely to do more damage then good...
I am a glazier by trade and I personaly would not attempt to polish on a assemebled tank, I have polished many glass edges, it is a very time consuming task that requires special equipment and is very easy to mess up...
Just my .02, hope that helps
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